The Guardian obtained this footage of Ian Tomlinson at a G20 protest in London shortly before he died. It shows Tomlinson, who was not part of the demonstration, being assaulted from behind and pushed to the ground by baton-wielding police (2:02):

Dramatic footage obtained by the Guardian shows that the man who died at last week’s G20 protests in London was attacked from behind and thrown to the ground by a baton–wielding police officer in riot gear.

Moments after the assault on Ian Tomlinson was captured on video, he suffered a heart attack and died.

The Guardian has handed a dossier of evidence to the police complaints watchdog. >>>

The police officer thought to be shown in video footage of the G20 protest in London pushing a man who later died has come forward.

An independent criminal probe has begun into the death of Ian Tomlinson, 47, who had a heart attack minutes later.

Additional video footage shown on Channel 4 News appears to show an officer striking him with a baton.

The Independent Police Complaints Commission (IPCC) is trying to identify officers who were at the scene.

The IPCC has ordered a second post mortem examination as part of its investigation. >>>